Function addSessionAnnotation

addSessionAnnotation(
params: AddSessionAnnotationParams,
): Promise<{ id: string } | null>
Add an annotation to a session.

The annotation can be of type "LLM", "CODE", or "HUMAN" and can include a label, score, and metadata. If an identifier is provided and an annotation with that identifier already exists, it will be updated.
Parameters
- params: AddSessionAnnotationParams
  The parameters to add a span annotation
Returns Promise<{ id: string } | null>
The ID of the created or updated annotation
Example
```
const result = await addSessionAnnotation({
  sessionAnnotation: {
    sessionId: "123abc",
    name: "quality_score",
    label: "good",
    score: 0.95,
    annotatorKind: "LLM",
    identifier: "custom_id_123",
    metadata: {
      model: "gpt-4"
    }
  }
});
```
- Defined in packages/phoenix-client/src/sessions/addSessionAnnotation.ts:45